Climate averages 1991–2020
Gebze weather
in September.
A warm, moderately wet month: the 4th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Gebze: daytime highs average 23.7°C and nights cool to about 16.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 45 mm of rain on roughly 7 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 30 min on an average September day.
The nearest other city in this atlas is Yalova (21 km away). In September its highs average 25.4°C, 1.6°C warmer than Gebze, with 48 mm of rain.
Among the 138 cities listed in Turkey, Gebze ranks joint 115th of 138 for the warmest September highs and 108th of 138 for the driest September (rainfall, lowest first). The mean September high of those 138 cities is 27.1°C; Gebze is 3.3°C cooler than that mean.
From September to October, average highs fall by 4.8°C to 19.0°C, and monthly rainfall rises from 45 mm to 62 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Gebze climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.8°C2.1°C | 2.1°C | 80 | 11.9 | 9.610 h |
| February | 8.8°C2.2°C | 2.2°C | 67 | 10.9 | 10.611 h |
| March | 11.3°C3.8°C | 3.8°C | 75 | 11.2 | 11.912 h |
| April | 15.7°C7.2°C | 7.2°C | 54 | 9.1 | 13.313 h |
| May | 20.5°C12.0°C | 12.0°C | 44 | 7.5 | 14.414 h |
| June | 24.7°C16.5°C | 16.5°C | 47 | 7.0 | 15.015 h |
| July | 27.2°C19.1°C | 19.1°C | 28 | 4.2 | 14.815 h |
| August | 27.4°C19.7°C | 19.7°C | 27 | 3.9 | 13.814 h |
| September, selected | 23.7°C16.6°C | 16.6°C | 45 | 6.6 | 12.513 h |
| October | 19.0°C12.7°C | 12.7°C | 62 | 8.6 | 11.211 h |
| November | 14.1°C8.0°C | 8.0°C | 62 | 8.9 | 10.010 h |
| December | 9.5°C4.2°C | 4.2°C | 86 | 11.7 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Yalova in SeptemberTurkey · 21 kmHigh 25.4°C · Low 17.6°C · 48 mm rain
- Sultanbeyli in SeptemberTurkey · 22 kmHigh 23.7°C · Low 17.5°C · 48 mm rain
- Sancaktepe in SeptemberTurkey · 28 kmHigh 23.7°C · Low 18.0°C · 48 mm rain
- Derince in SeptemberTurkey · 33 kmHigh 25.1°C · Low 16.7°C · 56 mm rain
- Ümraniye in SeptemberTurkey · 35 kmHigh 23.5°C · Low 17.9°C · 46 mm rain
- İzmit in SeptemberTurkey · 42 kmHigh 25.0°C · Low 16.5°C · 61 mm rain
- Üsküdar in SeptemberTurkey · 43 kmHigh 23.9°C · Low 18.2°C · 46 mm rain
- Istanbul in SeptemberTurkey · 47 kmHigh 23.9°C · Low 18.5°C · 46 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Gebze) is explained once on the Gebze year overview and on the Sources, method and limits page.